OOSDLab/virtual.cpp at master · altafahmad623/OOSDLab · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
#include <iostream>
using namespace std;
////////////////////////////////////////////////////////////////
class Base
//base class
{
public:
    virtual void show()
    //virtual function
    {
        cout << "Base\n";
    }
};
////////////////////////////////////////////////////////////////
class Derv1 : public Base
//derived class 1
{
private:
    int ft;

public:
    void show()
    {
        cout << "Derv1\n";
    }
};
////////////////////////////////////////////////////////////////
class Derv2 : public Base
//derived class 2
{
public:
    void show()
    {
        cout << "Derv2\n";
    }
};
////////////////////////////////////////////////////////////////
int main()
{
    Derv1 dv1;
    //object of derived class 1
    Derv2 dv2;
    //object of derived class 2
    Base *ptr;
    //pointer to base class
    ptr = &dv1;
    ptr->show(); //put address of dv1 in pointer
    //execute show()
    ptr = &dv2;
    ptr->show();
    return 0;
}